Malicious PDF — malware analysis report

Static analysis result for SHA-256 93104f4fe407d6ad…

MALICIOUS

PDF

64.5 KB Created: 2021-02-15 07:52:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f151341f55f277b47a6d3768fd9224ae SHA-1: 873e794f52684e8f2d6be36285ad6b19d0ca52fc SHA-256: 93104f4fe407d6ad1c6e10573d125b51ad160dbffa76b219a0d22edbb5aa20de
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'crophysi.ru'. The ML classifier and ClamAV also strongly indicate maliciousness. Although no scripts were extracted, the presence of a malicious URL within the document body suggests an attempt to lead the user to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crophysi.ru/123?utm_term=social+media+madness+worksheet In PDF document text
    • http://dekupedatibidal.iblogger.org/55665193589.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420019/normal_6029f535a4565.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488101/normal_5fc8c22dbfb2d.pdfIn PDF document text
    • http://vasuxarogaxatix.iblogger.org/clean_code_cheat_sheet_v2._4.pdfIn PDF document text
    • https://cdn.sqhk.co/wixexozesila/DBpgdjg/4827024334.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383695/normal_5ff9bf073447c.pdfIn PDF document text
    • https://cdn.sqhk.co/potasuregoz/rnlhcia/skull_coloring_books_for_adults.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445881/normal_601da7d59f5f6.pdfIn PDF document text
    • https://cdn.sqhk.co/zamokaxu/hifmqhi/interesting_facts_about_sedimentary_igneous_and_metamorphic_rocks.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zupenafud/charles_proxy_android_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/wapabefizosumi/83888135724.pdfIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/95824997215.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/95532624631.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/the_impossible_game_answer_23.pdfIn PDF document text
    • http://potimafekun.epizy.com/lakuwuratolilujeg.pdfIn PDF document text
    • https://s3.amazonaws.com/wumodukubaru/opportunity_cost_practice_problems_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/math_multiplication_worksheets_4th_grade.pdfIn PDF document text
    • http://ropanosuge.rf.gd/terraform_state_azure_storage_account.pdfIn PDF document text
    • http://safutid.epizy.com/98919910151.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/platform_bed_frame_king_uk.pdfIn PDF document text
    • http://debubiduselez.epizy.com/69740594326.pdfIn PDF document text
    • http://nemojasa.epizy.com/best_amharic_books_free.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC168 5440 bytes
SHA-256: 4ed837d661c256eb12609cdd229f1eb45fdd8a179d6e2c2760f315010bfe0c48
font_01_sfnt_off0000d3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CA 9720 bytes
SHA-256: 7060dbe261dfbdbadf472c2c6f050c06b2f4743b3b029face9dd25c667877f08

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